In the game of Nim one player always has a winning strategy — it depends on an unusual way of adding numbers.

Combinatorial Game Theory is a powerful tool for analysing mathematical games. Lewis Dartnell explains how the technique can be used to analyse games such as Twentyone and Nim, and even some chess endgames.
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.